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SQL Parser and Optimizer

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/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to you under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package com.hazelcast.org.apache.calcite.util.graph;

import com.hazelcast.org.checkerframework.checker.nullness.qual.Nullable;

import java.util.Collection;
import java.util.List;
import java.util.Set;

/**
 * Directed graph.
 *
 * @param  Vertex type
 * @param  Edge type
 */
public interface DirectedGraph {
  /** Adds a vertex to this graph.
   *
   * @param vertex Vertex
   * @return Whether vertex was added
   */
  boolean addVertex(V vertex);

  /** Adds an edge to this graph.
   *
   * @param vertex Source vertex
   * @param targetVertex Target vertex
   * @return New edge, if added, otherwise null
   * @throws IllegalArgumentException if either vertex is not already in graph
   */
  @Nullable E addEdge(V vertex, V targetVertex);

  @Nullable E getEdge(V source, V target);

  boolean removeEdge(V vertex, V targetVertex);

  Set vertexSet();

  /** Removes from this graph all vertices that are in {@code collection},
   * and the edges into and out of those vertices. */
  void removeAllVertices(Collection collection);

  List getOutwardEdges(V source);

  List getInwardEdges(V vertex);

  Set edgeSet();

  /** Factory for edges.
   *
   * @param  Vertex type
   * @param  Edge type
   */
  interface EdgeFactory {
    E createEdge(V v0, V v1);
  }
}